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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE AND OTHER SHORT-TERM BORROWINGS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Securities sold under agreements to repurchase          
Outstanding balance at end of year $ 152,458   $ 152,458   $ 395,433
Securities sold under agreements to repurchase and other short-term borrowings          
Securities sold under agreements to repurchase          
Securities pledged more than repurchase agreements (as a percent) 2.00%   2.00%    
Outstanding balance at end of year $ 152,458   $ 152,458   $ 395,433
Weighted average interest rate at end of period (as a percent) 0.02%   0.02%   0.02%
Fair Value of securities pledged $ 174,995   $ 174,995   $ 458,194
Average outstanding balance during the period $ 215,343 $ 363,905 $ 296,574 $ 363,518  
Average interest rate during the period (as a percent) 0.02% 0.02% 0.03% 0.03%  
Maximum outstanding at any month end during the period $ 169,691 $ 369,606 $ 367,373 $ 408,955  
Securities sold under agreements to repurchase and other short-term borrowings | U.S. Treasury securities and U.S. Government agencies          
Securities sold under agreements to repurchase          
Fair Value of securities pledged 76,312   76,312   244,707
Securities sold under agreements to repurchase and other short-term borrowings | Mortgage backed securities - residential          
Securities sold under agreements to repurchase          
Fair Value of securities pledged 52,513   52,513   82,666
Securities sold under agreements to repurchase and other short-term borrowings | Collateralized mortgage obligations          
Securities sold under agreements to repurchase          
Fair Value of securities pledged $ 46,170   $ 46,170   $ 130,821